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29
Site. For every 100,000 vaccinated children, the rate of small
xox mortality actually observed in Sheffield gives 9 deaths,
lor every 100,000 unvaccinated children the rate of small pox
Mortality actually observed gives 4400 deaths.
There is one section of the Sheffield population, previously
Noticed, which deserves, from its importance, to receive a
little further consideration. I refer to the re-vaccinated section.
During the years 1887 and 1888, 56,233 persons were revaccirated.
A portion of this class were living in invaded houses,and
rionsequently were exposed to the direct influence of infection,
dow does this section compare with the unvaccinated class ?
rt will be remembered that the unvaccinated numbered 6556
of all ages, that 1028 of these were seized with Small Pox,
and in the course of their illness 320 died. The revaccinated
section constitutes a body eight times the size of the unvacinated.
Its members were inhabiting the same bouses, living
under the same conditions, and exposed to the same
nfluences, yet out of this vast number two only were affected.
And their illness was of a type so mild, that in the official
leturns the disease was designated as "doubtful."
These observations, reflecting the conditions existing
during the epidemic period in the several sub-districts ot
Sheffield, taken with the minutest accuracy of detail, and
recorded with impartiality, show upon their face conclusive
Evidence of the remarkable protective influence resulting
from vaccination, and like a number of witnesses bearing
corroborative evidence with monotonous repetition of circumstance
they alike point to one conclusion.
Among those who recognise the value of vaccination
in affording protection from Small Pox, and, when
complete immunity is wanting, in mitigating the severity
of the attapk, not a few are found who dissent
*The Class hero mentioned is exclusively that in which revaccination was
oexformed during 1887 and 1888.